How to Choose Bored Pile Core Barrel? 1200mm Core Barrel Wtih Round Shank Chisel
详细信息
1200mm bored pile core barrel for 100mpa hard rock layer for liebherr-lb24 rig
1200mm core barrel with round shank chisel b47k22h for casagrande b175 for bored pile foundation work1200mm core barrel for bauer-bg33 rig for bored pile foundation work
Tianjin huachang xingye technology co ltd Round shank chisel Core Barrel
Main application:-Generally used to cut low fractured hard rock formation and partially fragmented medium hard rock formation up to (100 Mpa), suitable for cuttingthrough fissured rock
Features:-
Kelly box: 130-150-200 - other available upon request
Cutting ring with round shank picks with picks holders welded to the base ring.
Teeth: B47K22H or B40K12
other available upon request.
Wear protection: hard facing (standard)
or wear stripe (optional)
or tungstuds (optional)
| no | D | Total length | L | T1 | T2 | Kelly box | weight |
| 1 | 1500 | 1850 | 1200 | 20 | 40 | 200 | 1590 |
Cross cutter Core Barrel
Main application:-A Cross Cutter is designed mainly to used for break rock cores which remain in the borehole after using a core barrel.
The core is broken with round shank picks. Then cuttings are removed with heavy duty buckets.
It is also suitable for drilling hard, jointed rock (<100 MPa) and for penetrating through layers containing boulders.
Features:-
Kelly box: 130-150-200 - other available upon request
Teeth: B47K22H or B40K12
Cutting ring with tungsten roller bits welded into
the base ring of core barrel.
Quick Changeable Teeth Core Barrel
Main application:-up to strong rock (80 MPa), reinforced concrete suitable for boulders
Features:-
Kelly box: 130-150-200 - other available upon request
Cutting ring with tungsten carbide blocks welded into the base ring of core barrel.
Wear protection: hard facing (standard)
Roller Bits Core Barrel
Main application:-core barrel equipped with roller cutter bits
Generally used to cut very hard fractured, hard rock formation with compressive strength up to (200 MPa).
Features:-
Kelly box: 130-150-200 - other available upon request
Teeth: Single roller bit c/w bearing and carbide insert IADC 637 or IADC 737 - diam. 8.5 inch.
Cutting ring with tungsten roller bits welded into
the base ring of core barrel.
Choosing the right core barrel for bored piling is all about matching the tool's cutting mechanism and structural strength to the specific rock strata you are facing. Using the wrong barrel can lead to incredibly slow penetration rates, excessive teeth wear, or even a stuck tool.
Here is a comprehensive guide on how to choose the right bored pile core barrel based on rock hardness, compressive strength, and geological conditions.
1. Match the Core Barrel Type to Rock Hardness
Core barrels generally fall into two primary categories based on their cutting teeth: bullet teeth (round shank chisels) and roller bits.
A. Core Barrel with Bullet Teeth
This is your go-to tool for soft to medium-hard rock. The teeth break rock through a ripping and shearing action as the rig rotates.
Unconfined Compressive Strength (UCS): Best for rock ranging from 10 MPa to 60 MPa (up to roughly 100 MPa in highly fractured formations).
Ideal Formations: Sandstone, shale, weathered limestone, and medium-hard marl.
Design Tip: Look for staggered tooth arrangements to ensure full cutting face coverage and smoother rotation.
B. Core Barrel with Roller Bits (Cone Bits)
When the rock gets too hard for bullet teeth to penetrate, you must switch to roller bits. These work by crushing and chipping the rock via high downward pressure (crowd force) and rotation.
Unconfined Compressive Strength (UCS): Designed for hard to extremely hard rock above 60 MPa to over 120 MPa.
Ideal Formations: Granite, basalt, quartzite, dense limestone, and unweathered igneous rocks.
Design Tip: Ensure the roller bearings are highly sealed and lubricated to withstand the intense underwater and underground pressure.
2. Evaluate the Structural Design Options
Once you know the teeth type, you need to select the physical structure of the barrel based on the specific borehole conditions:
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